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University of Wisconsin-Madison Study Pinpoints Effects of Different Doses of an ADHD Drug; Finds Higher Doses May Harm Learning  
3/9/2012 7:20:44 AM

New research with monkeys sheds light on how the drug methylphenidate may affect learning and memory in children with attention deficit hyperactivity disorder. The results parallel a 1977 finding that a low dose of the drug boosted cognitive performance of children with ADHD, but a higher dose that reduced their hyperactivity also impaired their performance on a memory test.
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